diff options
Diffstat (limited to 'libsigsegv/src/stackvma-procfs.c')
| -rw-r--r-- | libsigsegv/src/stackvma-procfs.c | 188 |
1 files changed, 0 insertions, 188 deletions
diff --git a/libsigsegv/src/stackvma-procfs.c b/libsigsegv/src/stackvma-procfs.c deleted file mode 100644 index 24c90a1a..00000000 --- a/libsigsegv/src/stackvma-procfs.c +++ /dev/null @@ -1,188 +0,0 @@ -/* Determine the virtual memory area of a given address. - Copyright (C) 2002, 2006, 2008 Bruno Haible <bruno@clisp.org> - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2, or (at your option) - any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software Foundation, - Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ - -#include "stackvma.h" -#include <unistd.h> /* open, close */ -#include <fcntl.h> /* open */ -#include <sys/types.h> -#include <sys/mman.h> /* mmap, munmap */ -#include <sys/procfs.h> /* PIOC*, prmap_t */ - -#include "stackvma-simple.c" - -#if HAVE_MINCORE -# define sigsegv_get_vma mincore_get_vma -# define STATIC static -# include "stackvma-mincore.c" -# undef sigsegv_get_vma -#else -/* Cache for getpagesize(). */ -static unsigned long pagesize; -/* Initialize pagesize. */ -static void -init_pagesize (void) -{ - pagesize = getpagesize (); -} -#endif - -int -sigsegv_get_vma (unsigned long address, struct vma_struct *vma) -{ - char fnamebuf[6+10+1]; - char *fname; - int fd; - int nmaps; - size_t memneed; -#if HAVE_MMAP_ANON -# define zero_fd -1 -# define map_flags MAP_ANON -#elif HAVE_MMAP_ANONYMOUS -# define zero_fd -1 -# define map_flags MAP_ANONYMOUS -#else - int zero_fd; -# define map_flags 0 -#endif - void *auxmap; - unsigned long auxmap_start; - unsigned long auxmap_end; - prmap_t* maps; - prmap_t* mp; - unsigned long start, end; -#if STACK_DIRECTION < 0 - unsigned long prev; -#endif - - if (pagesize == 0) - init_pagesize (); - - /* Construct fname = sprintf (fnamebuf+i, "/proc/%u", getpid ()). */ - fname = fnamebuf + sizeof (fnamebuf) - 1; - *fname = '\0'; - { - unsigned int value = getpid (); - do - *--fname = (value % 10) + '0'; - while ((value = value / 10) > 0); - } - fname -= 6; - memcpy (fname, "/proc/", 6); - - fd = open (fname, O_RDONLY); - if (fd < 0) - goto failed; - - if (ioctl (fd, PIOCNMAP, &nmaps) < 0) - goto fail2; - - memneed = (nmaps + 10) * sizeof (prmap_t); - /* Allocate memneed bytes of memory. - We cannot use alloca here, because we are low on stack space. - We also cannot use malloc here, because a malloc() call may have been - interrupted. - So use mmap(), and ignore the resulting VMA. */ - memneed = ((memneed - 1) / pagesize + 1) * pagesize; -#if !(HAVE_MMAP_ANON || HAVE_MMAP_ANONYMOUS) - zero_fd = open ("/dev/zero", O_RDONLY, 0644); - if (zero_fd < 0) - goto fail2; -#endif - auxmap = (void *) mmap ((void *) 0, memneed, PROT_READ | PROT_WRITE, map_flags | MAP_PRIVATE, zero_fd, 0); -#if !(HAVE_MMAP_ANON || HAVE_MMAP_ANONYMOUS) - close (zero_fd); -#endif - if (auxmap == (void *) -1) - goto fail2; - auxmap_start = (unsigned long) auxmap; - auxmap_end = auxmap_start + memneed; - maps = (prmap_t *) auxmap; - - if (ioctl (fd, PIOCMAP, maps) < 0) - goto fail1; - -#if STACK_DIRECTION < 0 - prev = 0; -#endif - for (mp = maps;;) - { - start = (unsigned long) mp->pr_vaddr; - end = start + mp->pr_size; - if (start == 0 && end == 0) - break; - mp++; - if (start <= auxmap_start && auxmap_end - 1 <= end - 1) - { - /* Consider [start,end-1] \ [auxmap_start,auxmap_end-1] - = [start,auxmap_start-1] u [auxmap_end,end-1]. */ - if (start != auxmap_start) - { - if (address >= start && address <= auxmap_start - 1) - { - end = auxmap_start; - goto found; - } -#if STACK_DIRECTION < 0 - prev = auxmap_start; -#endif - } - if (end != auxmap_end) - { - if (address >= auxmap_end && address <= end - 1) - { - start = auxmap_end; - goto found; - } -#if STACK_DIRECTION < 0 - prev = end; -#endif - } - } - else - { - if (address >= start && address <= end - 1) - goto found; -#if STACK_DIRECTION < 0 - prev = end; -#endif - } - } - - fail1: - munmap (auxmap, memneed); - fail2: - close (fd); - failed: -#if HAVE_MINCORE - return mincore_get_vma (address, vma); -#else - return -1; -#endif - - found: - vma->start = start; - vma->end = end; -#if STACK_DIRECTION < 0 - vma->prev_end = prev; -#else - vma->next_start = (unsigned long) mp->pr_vaddr; -#endif - munmap (auxmap, memneed); - close (fd); - vma->is_near_this = simple_is_near_this; - return 0; -} |